Wolf 1061c

Wolf 1061 c is an exoplanet orbiting within the habitable zone of the red dwarf star Wolf 1061 in the constellation Ophiuchus, about 14.1 light-years from Earth. At the time of discovery, it was the closest known potentially habitable exoplanet to Earth, though several closer ones have since been found. It is the second planet in order from its host star in a triple planetary system, and has an orbital period of about 17.9 days. Wolf 1061 c is classified as a super-Earth as its mass is between that of Earth and Neptune. Wolf 1061 c is thought to be a super-Earth planet as its minimum mass is about 3.4 times that of Earth. Its radius is unknown, but predicted to be about 1.6 times that of Earth. The planet has an equilibrium temperature of 223 K (−50 °C; −58 °F), slightly higher than that of Mars. In astronomical terms, the Wolf 1061 system is relatively close to Earth, at only 14.1 light years away. The discovery was announced on 17 December 2015, following a study that used 10 years of archival spectra of the star Wolf 1061 using the HARPS spectrograph attached to the ESO 3.6 m Telescope at the European Southern Observatory at La Silla, Chile. The planet orbits a star named Wolf 1061, which is orbited by a total of three planets.